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crystal (kris´tal)

A solid of regular shape and, for a given compound, characteristic angles, formed when an element or compound solidifies slowly enough, as a result either of freezing from the liquid form or of precipitating out of solution, to allow the individual molecules to take up regular positions with respect to one another. [G. krystallos, clear ice, crystal]
asthma c.'s Charcot-Leyden c.'s
blood c.'s hematoidin
Böttcher's c.'s small c.'s observed microscopically in prostatic fluid that is treated with a drop or two of 1% solution of ammonium phosphate.
Charcot-Leyden c.'s c.'s in the shape of elongated double pyramids, formed from eosinophils, found in the sputum in bronchial asthma and in other exudates or transudates containing eosinophils.asthma c.'s, Charcot-Neumann c.'s, Charcot-Robin c.'s, Leyden's c.'s;
Charcot-Neumann c.'s Charcot-Leyden c.'s
Charcot-Robin c.'s Charcot-Leyden c.'s
chiral c. an enantiomorphic, dyssymmetric, optically active c.
chlorohemin c.'s Teichmann's c.'s
clathrate c. lattice-like arrangement of molecules of one substance surrounding molecules of another substance.
ear c.'s statoliths
Florence's c.'s brown rhombic c.'s formed at the interface between a drop of Lugol's solution and a drop of fluid that contains semen; not a specific test for the latter.
hematoidin c.'s hematoidin
hydrate c. one of several possible microstructural arrangements of water molecules based on intermolecular forces; suggested as being involved in the mode of action of inhalation anesthetics.
knife-rest c. a c. of ammoniomagnesium phosphate found in alkaline urine.
Leyden's c.'s Charcot-Leyden c.'s
Lubarsch's c.'s intracellular c.'s in the testis resembling sperm c.'s.
sperm c. , spermin c. a c. of spermin phosphate found in the semen; possibly identical to Böttcher's c.'s.
Teichmann's c.'s rhombic c.'s of hemin; used in microscopic detection of blood. See hemin.chlorohemin c.'s;
thorn apple c.'s ammonium urate c.'s in the shape of rounded bodies with many projecting points.
twin c. two c.'s that have grown together along a common face.
Virchow's c.'s yellow-brown, amber, or burnt orange c.'s of hematoidin, frequently observed in extravasated blood in tissues.
whetstone c.'s xanthine c.'s occasionally observed in urine.


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